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User Priority
(802.1P)
Eight classes are defined by 802.1p.
Highest priority is seven, which might go
to network-critical traffic such as Routing
Information Protocol.
Values five and six might be for
delay-sensitive applications such as
interactive video and voice
CFI CFI (Canonical format indicator). A 1-bit
indicator that is always set to zero for
Ethernet switches. CFI is used for
compatibility between Ethernet and Token
Ring networks. If a frame received at an
Ethernet port has a CFI set to 1, then that
frame should not be bridged to an
untagged port.
Note
The prioritization specification works at the media
access control (MAC) framing layer of the OSI
model. To be compliant with 802.1p, Layer 2
switches must be capable of grouping incoming
LAN packets into separate traffic classes.